.border-1px(@color: #ccc) {
    position: relative;
    &:after {
        display: block;
        position: absolute;
        left: 0;
        bottom: 0;
        width: 100%;
        border-top: 1px solid @color;
        content: '';
    }
}
.border-none() {
    &:after{
        display: none;
    }
}
.color (@a) {
    color: @a;
}

